Refrigeration apparatus



July 25, 1939. c. F. ALSING REFRIGERATION APPARATUS 2 Sheets-Sheet 1Original Filed June 18 '4! WITNESSES: ll pa.

INVENTOR CARL F. RLsme,

ATTO

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July 25, 1939. cfF. ALS ING 2,167,

\ REFRIGERATION APPARATUS Original Filed June 18, 1936 2 Sheets-Sheet 2INVENTOR CARI. F. ALs/Nci.

Fla. 4. I ATTO WITNESSES;

Patented July 25, 1939 REFRIGERATION APPARATUS Carl F. Alsing,Springfield, Mass., assignor to Westinghouse Electric & ManufacturingCompany, East Pittsburgh, Pa., a corporation of I PennsylvaniaApplication June 18, 1936, Serial No. 85,856 Benewed'June 29, 1938 15Claims. (Cl. 62-115) My invention relates to refrigeration apparatus andparticularly to refrigeration apparatus used generally for domesticpurposes.

It is an object of my invention to provide re- 5 -frigeration apparatusin which the moisture condensed in the cabinet is evaporated by heatdissipated from the apparatus and is carried from the cabinet with airpassing through the machinery compartment.

It is another object of my invention to utilize the evaporation ofmoisture condensate from the refrigerator to assist in dissipating theheat from.

operation of the refrigeration apparatus.

It is still another object of my invention to provide an improvedcooling system for heat generating portions of refrigeration apparatusby the use of a secondary refrigerant cooling circuit in conjunctionwith an arrangement utilizing the heat of vaporization of a tertiaryfluid, such as,

for example, the moisture condensate from the cooling element of therefrigeratingapparatus.

It is a further object of my invention to provide adequate cooling ofthe heat generating parts of the refrigerating apparatus.

It is still a further object of my invention to I totally enclose theoperating parts of a refrigeration machine, with sound insulation ifdesired,

and at the same time provide adequate cooling for said machine.

It is yet another object of my invention to provide an improvedarrangement for moisture condensate removal from the refrigeratedportions of a refrigerator, and more specifically to provide suchanarrangement in a refrigerator of the two-temperature type.

These and other objects are eflected'by my invention as will be seenfromthe following description and claims taken in connection with theaccompanying drawings forming a part of this application, in which:

Fig. l is a vertical sectional view of a two temperature refrigeratorembodying my invention;

Fig. 2 is ,a plan view of the 'motor compressor unit and coolingapparatus illustrated in Fig. 1 showing specifically the hot plate andthe refrigerant passages associated therewith which transmit heat to thehot plate;

Fig. 3 is an end view of the motor compressor unit and the secondaryrefrigerant cooling system preferably utilized in practicing myinvention; and,

Fig. 4 is a diagrammatic view of the refrigerating system preferablyused in practicing my invention.

Referring specifically to the drawings for a v This specific arrangementdetailed description of my invention, the cabinet l comprises a foodcompartment I2 and a machinery compartment l4 disposed below the foodcompartment. The food compartment l2 includes a food liner l6 which isdivided by a horizontal insulated partition l8 into a lower relativelycolder or freezing compartment 2lland an upper warmer food storagecompartment 22.

is described and claimed in the application of Milton Kalischer, 10Serial No. 751,324, filed November 3, 1934, and assigned to theWestinghouse Electric 8: Manufacturing Company.

The machinery compartment V I4 is divided into circulation of airthrough the compartment, and a compartment 26 containing a motorcompressor unit 23.

As shown in Figs. 1 and 4, the evaporator 28 refrigerates the coldercompartment and the 20 evaporator 30 refrigerates the warmer compartment22. The evaporator 28 is made up-of a plurality of tubes 32 connected attheir ends by a header 34 and secured to the under surface of the bottomwall portion of the food liner I6. The warmer evaporator 38 comprises aserpentine coil secured to the back surface of the rear wall portion ofthe food liner l6 adjacent to the warmer compartment 22. The outlet 36of the warmer evaporator is connected through a 30 conduit 38 to theinlet 40 of the compressor 42 which is enclosed together with itsdriving motor 44 by a hermetically sealed casing 46. The outlet 48 ofthe compressor 42 communicates with the plate condenser 58 through aconduit '52. The plate condenser 58, which preferably is of sheet metalconstructiomis attached to the back .wall of the cabinet ill by anysuitable means and is disposed within a flue 54 formed by an enclosure56 in cooperation with the rear wall of the cabinet.

As shown in Fig. 4, the plate condenser 50 is connected by a conduit 58to a float valve structure 60 which is fully described and claimed inthe application of Leslie B. M. Buchanan, Serial No. 15,003, filed April6, 1935, and assigned to the assignee of the present invention.

In the present embodiment, the float valve structure 60 serves as areservoir for part of the refrigerant charge in the refrigerating systemduring the period that the colder evaporator 28 is being refrigerated.As shown in Fig. 4, the float valve structure 60 comprises a chamber 62,

a needle valve 64 therein which controls the fiow of refrigerant to theevaporators 28 and 30, and a liquid refrigerant float member 66. Thefloat member 86 comprises -upperv and lower float members 66a and 68bwhich are fixed in a vertical spaced relationship by a stem 68; A weightI6 is also provided within the chamber 62 and is adapted to either reston the float member 68 or to be lifted by a solenoid A ,conduit I4,which is shown broken in Fig. l, connects the chamber 62 through theneedle valve 64 with the connecting chamber I6. The connecting chamberI6 connects the warmer evaporator 36 and the colder evaporator 28 witheach other and is disposed at a level higher than the header 34 of thecolder evaporator 28. The connections of the primary refrigerantcircuit,

and the float valve structure 60 are not shown tem. The control systemcomprises the line conductors L--I and L-2, the former being connectedto one terminal of the motor 44. The thermostat 80, which is actuated bythe temperature of the warmer compartment 22, has one contact connectedto the line conductor L2 and the other contact connected to one terminalof the solenoid12 through a conductor 82. The other terminal of thesolenoid I2 is connected through a conductor 84 to the conductor 86 andthe other terminal of the motor 44.

A thermostat I8, which is actuated by the temperature of the coldercompartment 26, is connected between the conductor L-2 and the con-.

ductor 86. Each thermostat is adjustable to provide a desiredtemperature within the respective compartments and may be of any desiredtype known in the art.

In the operation of the refrigerating system of the apparatus embodyingmy invention, assume that the warmer compartment 22 requiresrefrigeration while the colder compartment 26 is sufiiciently cold.Under this condition, the contacts of the thermostat 80 will be closedand those of thethermostat I8 will be open. An electrical circuit willbe set up which will cause the solenoid I2 and the motor 44 driving thecompressor 42 to be energized. The energized solenoid I2 lifts theweight I6 from the float 66, which, being relieved of the weight I0,maintains a lower liquid level in the chamber 62. The refrigeratingsystem is charged with a sufflcient quantity of refrigerant, so that,under this condition there is sumcient liquid refrigerant conveyedthrough the conduit I4 to the connecting chamber I6 to flrst completelyflll the cold evaporator 28 and then to supply sufllcient refrigerant tothe warm evaporator 30 for the operation thereof.

The refrigerating system now operates in the desired manner of suchapparatus to effect refrigeration of the warmer compartment 22. The inthe evaporator 30 is vaporized therein and is withdrawn from theevaporator 36 through the' conduit 38 by the compressor 42 wherein itspressure is increased. It is then condensed in the condenser 50 andreturned to the float chamber 62, through the conduit 58. Thecirculationof the refrigerant continues until such time as the temperature of thewarm compartment has been reduced to the lower limit for which thethermostat 80 has been set.

Assuming now that the colder compartment 20 is calling forrefrigeration, the contacts of the thermostat I8 will be closed and anelectrical circuit will be set up from the conductor L2 through thethermostat I8, through the motor 44 to the conductor L! to effectoperation of,

the motor 44. The solenoid I2 will be, deenergized regardless of whetherthe contacts of the thermostat I8 are open or closed, for if they areclosed, the solenoid is shunted by the thermostat 80. With thiscondition existing the weight I0 rests on the float member 66 causingthe liquid level in the float chamber 82 to rise to a higher levelwithin the chamber before the float member 66 will rise to open thevalve 64. Due to the high liquid level that must be maintained to floatthe float member 66, part of the refrigerant charge in the refrigeratingsystem is retained in the float chamber 62 with the result that only thecold evaporator 28 will be supplied with liquid refrigerant. The liquidrefrigerant remaining in the warm evaporator 36 from the previousoperation is first evaporated while condensed refrigerant is retained inthe float chamber 62 until the upper liquid level is reached. Furtheroperation of the compressor reduces. the suction pressure untilevaporation in the evaporator 28 takes place.

The refrigerating system now operates in the usual manner, therefrigerant supplied to the connecting chamber I6 flows into the header84 to .supply the colder evaporator 28. The refrigerant vaporized in theevaporator 28 passes through the evaporator 30 and being at a lowertemperature extracts some heat therefrom before passing through theconduit 38 to the compressor 44 wherein its pressure is increased. It isthen condensed in the condenser 50 and returned to the float valvechamber 62. When the temperature in the coldercompartment 20 is reducedto the lower limit for which the thermostat I8 is set, the latter willopen its contacts. If the contacts of the thermostat 88 are open, theoperation of the refrigerating system ceases, but if they are closed,the solenoid 'I2is energized and the motor compressor unit will continueto operate to effect refrigeration of'the warmer compartment 22 in themanner first described.

A more detailed description of the operation of the refrigerationapparatus maybe found in the application of Leslie B. M. Buchanan,Serial No. 15,003, flied April 6, 1935, and assigned to the WestinghouseElectric 8: Manufacturing Company.

In the refrigerating apparatus embodying my invention the motorcompressor unit 23 is resiliently mounted within the compartment 26 soas to minimize the transmission of the vibrations set up by themotor-compressor unit 23 to the cabinet. The upright walls of thecompartment 26 are covered with a sound-absorbing material 88, toprovide a noise shield which reduces to a minimum the noise emanatingfrom the compartment 26.

When the motor compressor unit 23 is enclosed to reduce the noisetherefrom, and when sound insulation is utilized, the problem of heatdissipation from the apparatus becomes acute and cooling means must beprovided to maintain the operating temperature at a safe value. Theproblem of removing moisture condensed out of the air within the cabinetis also present.

ing the motor and compressor.

In the apparatus embodying my invention some of the heat generated bythe working parts is utilized to evaporate the condensed moisture,

Thus, heat from the working parts .of the apparatus is dissipated to thecondensed moisture to secondary cooling refrigerant, surrounds a portionof the hermetically sealed casing 46 enclos- The jacket 90 communicateswith the inlet end of a conduit 92 attached by soldering or othersuitable means ,to a flat plate 94, through a conduit 96, and with asecondary refrigerant condenser 98 through a to collect the moisturecondensed therein. In the conduit I00. A conduit I02 completes thesecondary refrigerant circuit and provides refrigerant conveying meansbetween the outlet endof the refrigerant conduit 92 and the secondaryrefrigerant condenser 98. The secondary refrigerant condenser 98 ispreferably a single pass type with extended heat radiating surfaces 18,and is located in the flue 54, below the plate condenser 50 at the rear,of the cabinet Ill, as shown in Fig.

1. It will be obvious tothose skilled in the'art,

that both the plate 94 and the secondary refrigerant condenser 98 mayassume various forms without departing from the spirit of my invention.

In the warmer compartment 22, a trough I i2 is formed in the horizontalinsulated partition I8 colder compartment 20, a trough I I4 is formed inthe bottom wall portion of the food liner I6 to collect moisture fromthe colder compartment 26' when it is defrosted.

H4 is conveyed by conduits H6 and H8 respectively to a pan III), whichis disposed in the com--. partment 24 in heat exchange relation withplate 94 and which is of ample capacity to take care of all the moisturethat may collect in the compartments 20 and 22 under ordinary conditionsof operation or during defrosting of the'colder compartment 20. i

.The heat generated by the working parts of the apparatus causes thesecondary cooling refrigerant contained in the jacket to vaporize. Thevaporized refrigerant-passes from the liacket 90 through the conduit95,-to the refrigerantconduit 92 attached to the plate 94. The plate 94is heated by the vaporized secondary refrigerant in the conduit 92 andalso by heat radiated from the motor-compressor unit 23. Moisture in thepan H0, which is in heat exchange relation with the plate 94 istherefore caused to evaporate, and

abstract heat from the secondary refrigerant in] the conduit 92 throughthe medium of the plate 94. The condensed moisture may, therefore, betermed a tertiary cooling fluid for the motor compressor unit 23, sinceit cools the secondary refrig'erant in the conduit 32 and alsoabsorbsthe radiated heat fromthe motor compressor unit 23.

of the cabinet l0 opens into the flue 54 and provides an'outlet for theair entering the compartwithsaid motor compressor unit, a secondary ment24 through the openings I20.

The air entering the'com-partment 24 at the openings I20 passes over thepan III! and carries alongwith it the moisture evaporated from the .panI III by the heat generated by the working parts of the refrigeratingsystem. The moisture laden air enters the flue 54 through the openingI22 and due to the convection currents induced by the plate likeconstruction of the primary condenser 59, the air from the compartment24 is carried upward in the flue 54 to-coolthe secondary refrigerantcondenser 98 and the primary refrigerant condenser 59. The cooling airwhich enters the flue 54 at I 24 is discharged together with the airfrom the compartment 24 at I25.

The air entering the compartment 24 is at room temperature and has itsdry bulb temperature increased by' absorbing some of the heat radiatedby the motor-compressor unit 23. The relative humidity of the air is,therefore, decreased and its heat absorbing capacity increased. As theair passes over the water in the pan 0 it absorbs considerable moistureand sensible heat of the air is decreased by giving up heat required toevaporate the moisture absorbed. The sensible heat or the dry bulbtemperature of the air is therefore decreased and, since this air entersthe flue 54 and passes over both condensers the condensers operate at alower temperature than the room air temperature. The capacity of thecondensers and the efficiency thereof is therefore increased because ofthe lower temperature of the cooling medium.

It will be apparent from the foregoing thatmy inventionprovides'refrigerating apparatus which has an improved cooling systemfor the heat generating portions of the apparatus and in which theproblems of removing the moisture condensed in the cabinet and ofdissipating the heat generated by the working parts of the apparatus areused to offset each other by evaporating the condensed moisture withheat dissipated fromous changes and modifications without departing fromthe spirit thereof, and I desire, therefore,

that only such limitations shall be placed thereupon as are imposed bythe prior art or as are speciflcally'set forth in the appended claims;What I claim is:

1. In refrigerating apparatus. the combinationof means for circulating aprimary refrigerant and embodying elements from which heat is to beremoved,a circulatory system for a secondary refrigerant includingcooling means disposed in heat exchange relation with said elements, asecondary refrigerant condenser communicating with said cooling means; arefrigerant container in series w th said cooling means and said con-'denser, and a tertiary cooling fluid disposed in heat exchange relat onwith said container, said secondary refrigerant being vaporized in saidcooling means to abstract heat from said elements. then cooled in saidcontainer by the tertiv ary cooling fluidand finally liquefied in saidconcondensed moisture to said receptacle,

condenser communicating with said cooling means, a refrigerantconducting coil series with said cooling means and said secondarycondenser, and a tertiary fluid in heat exchange relation with saidcoil, said secondary refrigerant being vaporized in said cooling meansto abstract heat from said motor compressor unit and then cooled in saidcoil by the tertiary fluid and liquefied in said condenser.

3. In refrigerating apparatus, the combination of means for circulatinga primary refrigerant including a motor compressor unit and anevaporator, a circulatory system for a secondary refrigerant includingcooling means disposed in heat exchange relation with said motorcompressor unit, a secondary condenser communi- .cating with saidcooling means, a refrigerant conducting coil in series with said coolingmeans, a collecting means for receiving condensate from said evaporatorand disposed in heat exchange relation with said coil, said secondaryrefrigerant being vaporized in said cooling means to abstract heat fromthe motor compressor unit and then cooled in said coil by the condensatein said collecting means and liquefied in said condenser.

4. In refrigerating apparatus, the combination of means for circulatinga primary refrigerant including a motor compressor unit and anevaporator, a circulatory system for a secondary refrigerant includingcooling means disposed in heat exchange relation with saidmotor-compressor unit, a secondary refrigerant condenser communicatingwith said cooling means, a refrigerant conducting coil in series withsaid cool- "ng means and said secondary condenser, a plate disposedabove said motor compressor unit in heat exchange relation with saidcoil, collecting means for receiving condensate from said evaporatordisposed in heat exchange relation with said plate, said secondaryrefrigerant being vaporized in said cooling means to abstract'heat fromsaid motor compressor unit and then cooled in said coil by thecondensate in said collecting means and liquefied in said condenser.

5. A refrigerating apparatus comprising a cabinet embodying a foodcompartment and a machinery compartment disposed below said foodcompartment, a refrigerating system associated with said cabinetincluding heat generating elements mounted in said machinerycompartment, an evaporator in thermal exchange with said food(compartment, a circulatory system for a secondary refrigerant includingcooling means disposed in heat exchange relation with said heatgenerating elements, a secondary condenser connected to said coolingmeans, a container for secondary re-,

frigerant communicating with said cooling means and said secondarycondenser, a plate arranged in heat exchange relation with saidcontainer, means in'said food compartment to collect moisture condensedtherein, a receptacle for said condensed moisture disposed in heatexchange rela tion with said plate, means for conveying said saidsecondary refrigerant being effective to absorb heat by vaporization insaid cooling means and being cooled and liquefied by passage throughsaid container and said secondary condenser, said cooled and liquefiedsecondary refrigerant being then returned to said cooling means foragain absorbing heat from said heat generating elements. f

6. A refrigerating apparatus comprising a cabinet embodying a foodcompartment and a machinery compartment disposed below said foodcompartment, a refrigerating system associated with said cabinetincluding heat generating elements mounted in said machinerycompartment, an evaporator in thermal exchange with said foodcompartment, a circulatory system for a secondary refrigerant includingcooling means disposed ln heat exchange relation with said heatgenerating elements, a secondary condenser connected to said coolingmeans, a container for secondary refrigerant communicating with saidcooling means and. said secondary condenser, collecting means in saidfood compartment to receive moisture condensed therein, a receptacle forsaid condensed moisture disposed in heat ex-- change relation with saidsecondary refrigerant container, means for conveying said condensedmoisture to said receptacle, said secondary refrigerant being effectiveto absorb heat by vaporization in saidcooling means, said moisture beingevaporated by heat dissipated from said vaporized refrigerant in saidcontainer and by heat radiated from said heat generating elements tosaid collecting means said secondary refrigerant being cooled andliquefied by passage through said container and said secondarycondenser, said cooled and liquefied secondary refrigerant being-returned to said cooling means to again absorb heat from said heatgenerating elements.

7. A refrigerating apparatus comprising a cabinet embodying a foodcompartment and a machinery compartment disposed below said. foodcompartment, a refrigerating system associated with said cabinetincluding heat generating elements mounted in said machinerycompartment, an evaporator in thermal exchange with said foodcompartment, a circulatory system for a secondary refrigerant includingcooling means disposed in heat exchange relation with said heatgenerating elements, a secondary condenser connected to said coolingmeans, a container for secondary refrigerant communicating with saidcooling means and the secondary condenser, collecting means in said foodcompartment to receive moisture condensed therein, a receptacle for saidcondensed moisture disposed in heat exchange relation with saidsecondary refrigerant container, means for conveying said condensedmoisture to said receptacle, said secondary refrigerant being effectiveto absorb heat by vaporization in said. cooling means, said moisturebeing evaporated by heat dissipated from said vaporized refrigerant insaid container, means for directing air through the machinerycompartment to convey said evaporated moisture externally thereof, saidsecondary refrigerant being cooled and liquefied by passage through saidcontainer and said secondary condenser, said cooled and liquefiedsecondary refrigerant being returned to said cooling means to againabsorb heat from said heat generating elements.

8. A refrigerating apparatus comprising a cabinet embodying upper andlower food compartments and a machinery compartment disposed below saidfood compartments, a refrigerating system associated with said cabinetincluding heat generating elements mounted in said machinerycompartment, evaporators in thermal exchange with respective foodcompartments, one of said evaporators being maintained at a lowertemperature than the other with said lower food compartment, acirculatory system for a secondary refrigerant including cooling meansdisposed in heat exchange relation with said heat generating elements, asecondary condenser connected to said cooling means, a container forsecondary refrigerant communicating with said cooling means and withsaid secondary condenser, collecting means in said upper foodcompartment and in said lower food compartment to receive moisturecondensed therein, a receiver for said condensed moisture disposed inheat exchange relation with said secondary refrigerant container, meansfor. conveying said condensed moisture to said condensate receiver, saidsecondary refrigerant being effective to absorb heat by vaporization insaid cooling means, said moisture being evaporated by heat dissipatedfrom said secondary refrigerant containensaid secondary refrigerantbeing cooled and liquefied by passage through said container and saidcondenser, said cooled and liquefied secondary refrigerant beingreturnedto said cooling means to again absorb heat from said heatgenerating elements.

9. A refrigerating apparatus comprising a cabinet embodying a foodcompartment and a machinery compartment disposed below said foodcompartment, a refrigerating system associated with said cabinetincluding compression means mounted in said machinery compartment and anevaporator in thermal exchange with said food compartment, an air flueassociated with the cabinet, heat absorbing means containing a secondaryvaporizable refrigerant disposed in heat exchange relation with saidcompression means, a secondary refrigerant container connected to saidheat absorbing means, collecting means for condensed moisture in saidfood compartment, a receiver for said moisture in heat exchange relationwith saidsecondary refrigerant container, and means conveying saidmoisture from said food compartment to said receiver whereby heatabsorbed by said secondary refrigerant from said compression'means isutilized to evaporate said moisture and cool said secondary refrigerant,said flue being in communication with said machinery compartment wherebyair containing evaporated moisture is removed from said machinerycompartment through saidflue.

10. A refrigerating apparatus comprising a, cabinet embodying a foodcompartment and a machinery compartment disposed below said foodcompartment, 2. refrigerating system associated with said cabinetcomprising a motor compressor unit mounted'in said machinerycompartment, a casing enclosing said motor compressor unit, a jacketsurrounding said enclosed motor compressorunit and in heat exchangerelation therewith, an evaporator in thermal exchange with said foodcompartment, an air flue associated with said cabinet, a secondaryrefrigerant condenser connected to said jacket, a secondary refrigerant0011- connected to said secondary condenser and said jacket, means insaid food compartment to collect the moisture condensed therein, acontainer for said moisture disposed in heat exchange relation with saidcoil, means conveying said moisture from said compartment to saidcontainer whereby heat absorbed by said secondary refrigerant from saidmotor compressor unit is transmitted by said coil to said container toevaporate said moisture and cool said'secondary refrigerant, said fluebeing in communication with said machinery compartment, whereby aircontaining evaporated moisture from said container is removed from saidmachinery compartment through said flue, said secondary condenser beingcooled by air passing through said flue. i

11. A refrigerating apparatus comprising a cabinet embodying a foodcompartment and a machinery compartment disposed below said foodcompartment, a refrigerating system associated with said cabinet,comprising a motor compressor unit, a casing enclosing said motorcompressor unit, a jacket surrounding said casing and in heat exchangerelation therewith, an evaporator in thermal exchange with said foodcompartment, a primary condenser on one of the walls of said cabinet, aflue associated with said cabinet surrounding said primary condenser, asecondary refrigerant condenser disposed in said flue ad- Jacent to saidprimary condenser, a secondary refrigerant coil connected to said jacketand said secondary condenser, means in said food compartment to collectthe moisture condensed therein,

a container for said moisture disposed in heat exchange relation withsaid coil. and means conveying said moisture from said compartment tosaid container, whereby heat absorbed by said secondary refrigerant fromsaid motor compressor unit is transmitted by said coil to said containerto evaporate said moisture and cool said secondary refrigerant, saidflue being in communication with said machinery compartment, whereby aircontaining evaporated moisture is removed from said machinerycompartment and combines with convection air currents induced by saidprimary condenser to cool both of said condensers.

12. A refrigerating apparatus comprising a cabinet embodying upper andlower food com-- partments, a machinery compartment disposed below saidfood compartments and means for conveying air through said machinerycompart-- ment, a refrigerating system associated with said cabinetcomprising a motor compressor unit, a casing enclosing said motorcompressor unit, a jacket surrounding said casing and in heat exchangerelation therewith, an evaporator in thermal exchange with said upperfood compartment, a colder evaporator in thermal exchange with saidlower food compartment, 2. primary condenser mounted on one of the wallsof said cabinet and forming with the cabinet, an air flue, a secondaryrefrigerant condenser disposed adjacent'to said primary condensenandsubject to the flue action of said primary condenser, said secondarycondenser being connected to said jacket, a secondary refrigerant coilconnected to said secondary condenser and said jacket, co-llecting meansin said food compartments to receive the moisture condensed therein, acontainer orated moisture is removed through said flue and passesupwardly in said flue with convection air currents induced by'saidprimary condenser to cool said primary condenser and said secondarycondenser.

13. A refrigerating apparatus comprising a cabinet embodying a foodcompartment and a machinery compartment disposed below said foodcompartment, an inlet and an outlet for air in the machinerycompartment, a refrigerating system associated with said cabinetcomprising a motor compressor unit disposed in said machinerycompartment, a sound-proof enclosure for said motor compressor unit, ametal casing sealing said motor compressor unit, an evaporator inthermal exchange with said food compartment, an air flue associated withsaid cabinet, a jacket containing a secondary vaporizable refrigerantsurrounding said metal casing and in heat exchange relation therewith, asecondary refrigerant condenser connected to said jacket, a secondaryrefrigerant coil connected to said secondary condenser and said jacket,means in said food compartment to collect moisture contained therein, acontainer for said moisture disposed in heat exchange relation with saidcoil, means conveying said moisture from said compartment to saidcontainer, whereby heat absorbed by said secondary refrigerant from saidmotor compressor is transmitted from said coil to said container toevaporate said moisture into the air in said machinery compartment andto cool said secondary refrigerant,

unit disposed in said sound insulated section of said machinerycompartment, a metal casing sealing said motor compressor unit, anevaporator in thermal exchange with said food compartment, an air flueassociated with said cabinet, cooling means containing a secondaryvaporizable refrigerant disposed in heat exchange relation'with saidmetal casing, a secondary refrigerant condenser connected to saidcooling means, a secondary refrigerant container connected to saidcooling means and the secondary refrigerant condenser, means in saidfood compartment to collect moisture contained therein, a receiver forsaid moisture disposed in heat exchange relation with said container,means conveying said moisture from said compartment to said receiver,whereby heat absorbed by said secondary refrigerant from said motorcompressor unit is transmitted from said container to said receiver toevaporate said moisture into the air in said machinery compartment andto cool said secondary refrigerant, said flue being in communicationwith said machinery compartment whereby air containing evaporatedmoisture from said receiver is removed from said machinery compartmentthrough said flue.

15. A refrigerating apparatus comprising a cabinet embodying upper andlower compartments and a machinery compartment disposed below said foodcompartments, said machinery compartment divided into a noise-proofcompartment and a compartment through which air circulates, arefrigerating system associated with said cabinet comprising a motorcompressor unit disposed in said noise-proof compartment, a

metal casing sealing said motor compressor unit, an evaporator in heatexchange relation with the upper food compartment, a colder evaporatorin thermal exchange with the lower food compartment, an air flueassociated with said cabinet, a secondary refrigerant condenserconnected to said jacket, a secondary refrigerant coil connected to saidjacket and said secondary refrigerant condenser, means in said foodcompartments to collect moisture condensed therein, a container for saidmoisturedisposed in heat exchange relation with said coil, and meansconveying said moisture from each of said food compartments to saidcontainer, whereby heat absorbed by said motor compressor is transmittedfrom said coil to said container to evaporate said moisture and coolsaid secondary refrigerant, said flue being in communication with saidair circulating compartment of said machinery compartment, whereby aircontaining evaporated moisture from said container is removed fromsaid'machinery compartment through said flue.

CARL F. ALSING.

